Study On The Overall Theory And Application About Hybrid Base-Bleed-Rocket Extended Range Artillery Projectile

The overall theory and application about a hybrid base-bleed-rocket extended-range projectile is studied in this paper.In view of the fact that there are three types of a hybrid base-bleed-rocket extended-range projectile and they are different from each other in the general structural layout, their structural characteristics and the work performance of the two propellant units is analyzed in this paper. And the effect of the work order of the two propellant units to the performance of the trajectory and the matching conditions to obtain the theoretical optimum trajectory is discussed too.According to the ballistic speciality of a hybrid base-bleed-rocket extended-range projectile during base-bleed and rocket work, its physical parameter is non-constant, such as its mass position of mass centre polar and equatorial moment of inertia. After a mulriple ballistic model of constant physical parameter is established, a mulriple ballistic model of continuous and non- continuous physical parameter is educed and the program is compiled, the theoretical tool is constructed to study othe other pivotal technology of a hybrid base-bleed-rocket extended-range projectile.It has been maked for immediate and statistical analysis that the calculation about the work order parameter of the base-bleed-rocket is calculated in the Taguchi method, its influencing trend is bring out in the open, the theoretical base is settled for confirming the greatest combination about the work order parameter of the base-bleed-rocket. The multi-objectile optimal design model is established that the indexes have been taked into account first and synthetically, such as physical parameter range lethality power strength and flight stability and so on , the program is compiled and the example is calculated. The true worth of the theoretical work in this paper is validated by flight experimentation of 130mm hybrid base-bleed-rocket extended-range principium projectile.It is very important that the extended range effect is improved farthest by being master of the dynamic delay-time of a rocket-portfire in the air. According to the "solid-particle" theoretical model, a theory model of thedynamic burning-velocity of a rocket-portfire in its igniting delay-time cannulation is established, a theory model of the dynamic delay-time is educed. The factors are analyzed, setting position and shape of a igniting delay-time cannulation that affect its igniting delay-time, the theoretical basis is offered to develop the high-level precision rocket-portfire in the air.A secondary expansive principle of the burning gas pressure vary without the external pressure is presented in this paper. It can be used not only to change the fire precision of the base bleed projectile, but also to improve the effect of reduction drag and expansion range. The calculating model of the secondary expansive pressure of the burning gas is constructed By means of analysis of the experimental resuits, it has been confirmed that the new base bleed unit can be designed, with the secondary expansive principle of the burning gas pressure. The engineering project of a hybrid base-bleed-rocket high-level efficient extended-range projectile is designed, with the secondary expansive principle of the burning gas pressure, the feasibility and the true worth of its engineering applications is validated in theory.